Electric motor.



LQQSSSS.

ELECTRIC MOTOR.

APPLICATION HLED IAN. 3 1913, RENEVJED OCT. 5. 1918.

Yu'lfntd Duw. 21;, ll',

w21/'imaged G. A. BURNHAM.

ELECTRIC MOTORK APPLICATION F\LED )AN.3-!913. RENEWED OCT. 5, 1918. 1,288,503, Putened Dec. 5%, i918.

T OFFICE GEORGE A. BURNHAM. OF SAUGUS. MASSACHUSETTS, ASSIGNOR TO SERSB.

CGNDIT. JR.. OF BROOKLINE. MASSACHUSETTS.

Application VIfiled January 1913. Serial No. 789.927.

lle it known that l. Nicolini: lli'nxirvn, a eitixen of the lvnitetl Statiresiding at Sangria. in the County ot' llssex and State ot Iiasaaelinsetts. have inventeil an improvement in llleetrio Motors. of whit-h the fnllowing is a speeification.

This invention ielaters to elertiie-motors. :intl has vfor its ohjee the eonfai'netion of an eleetiie-nn'itor which nia)v he einplovml for eonnecting' a ilriven-nn-inlwi with a .fhivingineinhei'. ainl for illivingf anni nieniliers, wrhen eonnaetion is mail@ anil permitting; ilisrfonnection of l ai l ineinhers innnialiatelj.v npon eessation ot' the flow nt enrrent. and also tor other purposes.

ln the enihoilinient ol' inji' invention here how i. for the yaalie ot' illustration. inovahh" means is arranged in the inagnetieiehl of the motor. whieh means ina;Y he a part ot' the hohl-traine of the motor. anni which ia movable hv 'the altraetive tor-ve ot' the tieltl when a enri'ent traverses the field-mils. 'lhe invention also einhotlies a (lrivenaneniher ai'rangl'eil to he niovotl into eoperntive relation with n ilriving-member hy Said niovahle ineana. and a driving' nienihei' which is Conneeteil with the 1ahalt ot' the mo` tor S as to he operated hy the inotor'to (hive the l1'i.en-inen1ber when saitl ineinhers are in engagement, )Jet when the llow of enrient -ceases the movable-mentira Controlling;i the tlriven-member innneiliately returns to its normal retracted position. disconnecting the (liiven-member troni the driving-ineinhor.

rEhe invention also embodies means vonA tiollefl h v said electroinagnetie niovnhlemeans: to in tnln t'onz'ol they starting ot the motor. antl in carrying: ont this feature o" lthe invention a brake ina): he arranged on tho armature oi" th.` motor to restrain its rotation. whit-h is ailaptotl to he operated hy saiil inovahle-nieaiw to releane thev armatureor n switeh I'or tln` vii-enit of the. armature niay he pi'ovnleil whieh is onti'olle l by said inoval'ilefineana. "l`lie invention also has for its object the provinion ot ineans arranged onor in eonneetimi with aiil inovnhle-ineans to pr=.:. nt the saint troni ehattering when Specification of Letters Patent.

Renewed October 5. 1918. Serial No. 257,063.

an alternatiing` cin-rent is canned to traverse the eXeiting-eoils ot' the motor.

Figaro 1 is a Silla elevation of an eleetriw motor einlnnlying this invention.

Fig'. 2 is an end elevation of tho mine. Fig'. 3 is a detail illustrating the drivenineinher in engagement with the driving'- ineinber.

Fig. t is a side elevation ol a port-ion of the eleetrie-1notor bhown in Fig'. l, illustratinLY a inoiliieil means for controlling th@x tarting' of the motor. f

rlhe eleerio-inotor here Shown for villustrating;` in v invention is of the rotar;v reptilsion type. l0 representI the rotary arinature of the motor whieh is supported in suitable hearings. The held-traino of the ntor i or nia v he niaile in two parts, divided on a horizontal line or otherwise,l representing the npper part anti 51 the. lower' part. and baitl parts are hingedlv connected together at 52. so that the lower part is Inovahle toward anti from the upper part, while the ripper part is helil :tationarily, heing eonneeleil with a siipporting-frame Othe!- than making.Y the lieltllranie with a movable part oi element.r it will he von- `s'trncteil. generally speaking'. in any usual or nitahle manner to lanpport the field-Coils. ilovenient of the lower part 5l in a ilireff tion awa); r'roin the upper part is limited by an atljnstahle `vieltling stop eoinprising, as here shown. a pin 55. extended thi-(nigh an ear 56, arranged thereon. which engages a npring 5T renting against a fixe-l ahntinent Titi whieh may he a ilownwaril extension olr the upper part; ol' the traine. Movement ol Said lower part fil in a iliz'ee'tion towaiil theJ stationarv part in) is eontrolleil h v a .Wi-ing 59 nrrangjetl on n tixetl pin UU ainl hearing at one enil against a nnt on sait! pin :intl at the other enit against nn lar 5t. Said lower part 31 of the lelil-l'raine. heiinglr in the niagnetie-ielil ol' the inotnr. will he inovefl by the attraetive inllnenee of Saiil field. Said 1novahlepart..' l ot' the lielil-franle serversl as and eonstitntea niovahleaneans nrrangedin the n'iagnetie-tiehl nl' the motor, and which is inoveil hv the attrattive influence of saiil rielil. but in v invention inelntles any other 100 rotated by the motor.

form of movable-means arranged in the magnetic-field of the motor and Which is movable by the attractive influence of said field, Whether it is or is not a part of the field-frame of the motor. The movablemeans may be employed for the accomplish- `1nent of several different results and, as here shown, one of the results which it is designed to accomplish is to connect a driven-member with a driving-member and subsequently operate both members. As here shown, one end of the motor-shaft is threaded as vat 49, to form a Worm which constitutes the driving-member, and a Worm-Wheel 43 may be employed as the driven-member, which latter is secured to a shaft 42, borne by the movable-part 51 and arranged beneath the Worm so that it is movable into and out of engagement With the Worm upon correbers is controlled by the current.

f Said movable means or part 51 may be em'ployed to control the starting of the motor by controlling the armature thereof, and, as shown in Figs. 1 to 3, a brake 86 is arranged on the armature-shaft which is connected with the movable-part 51, and when .said part 51 is in its normal or retracted position said brake will be applied and will hold said armature-shaft against rotation,

I' but when said part 51 is moved toward the part said brake will be operated to release the armature Shaft, permitting said shaft to rotate.

vIn Fig. 4 modified means are shown for accompllshing this result, said means conssting of a switch-member 20, arranged on the movable-part 5l, adapted to engage the switch-members 21, which are connected with'a circuit 22 of the armature-Winding of the motor, and when said movable-part I51`is moved said circuit will be closed by the switch andthe motor started. Hence I desire to sinclude Within the scope of this feature of my Ainvention any equivalent means be 'control for starting the motor, which is arranged to ed by the movable-means arranged in the magnetic-field of the motor and adapted to be moved by the attractive influence of said Held.

When the field-frame has a movable part,

as 51, and an alternating current is caused to traverse the exciting-coils of the motor, said part is liable to chatter, and to obviate chattering I havearranged on one or both polesof said part 5l an endless band or ring of copper or other conducting material, shown at 90, which surroundsa portion of the end thereof. This conducting band or ring forms an isolated closed circuit whichv s so arranged in the magnetic-circuit that a current of a phase relation different from that in the fieldcoils may traverse the closed circuit and cause said part 51 to remain in attracted position. It Will be understood that all of the features here shown may or may not be employed according to the Work which it is intended the motor shall perform.

1. An electric-motor having a part of its field-frame movable with respect to the remaining portion thereof and adapted to be moved by the magnetic influence of the field,

a switch controlling-the circuit of the exciting-coils of the armature of the motor, arranged for operation by said movable part of the ield-frame when in attracted position, thereby to control the starting of the' armature, substantially as described.

2. An electric-motor having a part of its field-frame movable with respectto the remaining portion thereof, and adapted to be' moved by the magnetic influence of the field,"

a switch controlling the circuit of the exciting-coils of the armature of the motor arranged for operation by said movable part of the field-frame When in attracted position, thereby to control the starting of the armature, and means to regulate the attractive movement of said movable part, sub.

stantially as described.

3. An electric-motor field-frame movable with respect to the remaining'portion thereof, and adapted to be moved by the magnetic influence of the field,

and means controlling the starting of the armature of the motor operated by said movable part of4 the field-frame, substantially as' described. i

4. An electric field frame made movable with respect-to the remaining portion thereof by the y'mag'- netic influence of the field, means controlling 4 the starting of the armature of the motor adapted for operation by Asaid movable part rof the eld, a driving-member and a drivenmember, normally disengaged, and ada ted to be engaged by said movable parto the field frame, whereby the motor is started and the driving and driven-members engaged at-substantially the same time.

5. An electric vmotor having a part of its eld frame made movable with respect to the remainingportions thereof, by the maghaving a part of its motor having a 'part of its n'etcjnuence of the field, a driving-Inmuben eonnectednwith the motor Shaft, a drivenmoto'haft movable into and out of engagement with tHe drvngmember by said movable port of the field frame, un electric circuit, for the armature nductively related to thefield coils, a switch for smid circuit to control the starting of the armature, the movable-member of which s adapted for operation by Said movable part of the fieldl frame, whereby J(he motor is started and che driven-member moved into engagement Wlth the drlvlng-member at substantmlly the same time.

In testimony whereof, 'have signed xny`15 name to this specification, in the presence 

